Drain for electrical apparatus enclosures



July 6, 1954 e. a. GRIFFIN DRAIN FOR ELECTRICAL APPARATUS ENCLOSURES Filed Aug. 10, 1950 INVENTOR. GUY 6 G E lfi/Y Patented July 6, 1954 DRAIN FOR EIiECTRIGAL APPARATUS ENCLOSURES I Guy G. Griffin-, .Houston,. '1ex., assignor to Grouse- Hind s-Company, Syracuse, N. Y., a corporation of New York.

ApplicatiomAugvus-tilfl, 195.0, serial'No. 178,597

3 Claims.

This invention relates to drains for explosion proof enclosures for electrical apparatus.

The invention has as an object a drain of the type referred to formed with a sediment collecting sump for the reception of rust and other sediment materials, permitting the drain to function properly over long periods of time without becoming plugged up.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a vertical sectional view of a drain embodying my invention.

Figure 2 is a top plan view of the structure shown in Figure 1.

Figure 3 is a view taken on line 3-3, Figure 1.

The drain consists of a body member ID, one end of which is threaded externally as at ll, whereby the body is adapted to be threaded into the wall of the enclosure indicated in dotted outline l2, Figure 1. The lower or outer portion [3 of the body is shown as of hexagonal form for the reception of a wrench by which the body may be tightly threaded into the enclosure.

The body is formed with an internally threaded bore into which a plug member 14 is threaded. The plug is a loose threaded fit in the body to permit moisture, or condensation, to drain downwardly through the threaded connections between the plug and the body. The upper end of the body is formed with a cylindrical recess l5 which, in conjunction with a tubular member it, forms a recess for the collection of sediment. The lower end of the tube Ii; terminates in juxtaposition to the upper end of the plug I4, and the tube is provided, adjacent its upper end, with one or more apertures I! arranged to form drain outlets from the sump. The upper end of the tube is preferably provided with a canopy-I8 overhanging the recess [5 and which functions to prevent sediment accumulating on the upper portion of the tube and possibly closing oi the apertures l1.

The lower or outer end of the plug I4 is formed with a reduced portion flattened on opposite sides. A collar 2!, formed with a cross shaped aperture at'its center, is mounted on the portion 20 and has a radially extending arm portion 22 terminating in an end portion 23 bent to extend upwardly about the lower portion I3 of the body [0. A stop pin 24 projects from the lower end vent a complete rotation of the plug.

of the body for engagement by the arm 22, and these members are accordingly cooperable to pre- A cup shaped member 26 is placed over the collar 2i, and these two members are detachably secured to the outer end of the plug as by a screw 21. The cup shaped member 26 is formed with a horse-shoe shaped depresison 28, and a plurality of apertures 29.

With this arrangement, moisture within the enclosure l2 collects in the sump I5, as indicated by the arrows 3B, and drains into the tube [6 through the apertures H, as indicated by the arrow 3|. The condensate then passes downwardly between the plug and the body, as indicated by the arrows 32, and outwardly through the apertures 29, as indicated by the arrow 33. Any sediment carried down by the moisture within the enclosure collects in the sump [5 which is of sufilcient dimension to permit the drain structure to function for a long period of time before the sediment reaches a height to interfere with the apertures [1. At periodic intervals, the drain as a unit may be removed from the enclosure and the sediment removed from the sump l5.

What I claim is:

1. An explosion proof drain for electrical appa ratus enclosures comprising a body adapted to be threaded in the bottom wall of the enclosure and having an internally threaded vertical bore extending inwardlyfrom the lower end thereof, a plug threaded in said bore, said plug being a loose threaded fit in the body for withdrawing condensate from within the enclosure, a tube mounted vertically in the body with the lower end of the tube arranged in communication with the upper end of said plug, the upper portion of the body being formed with a recess encircling the upper portion of said tube and forming a sediment collecting sump, and said tube having a drain inlet at its upper end.

An explosion proof drain for electrical app ratus enclosures comprising a body adapted to be threaded in the bottom wall of the enclosure and having an internally threaded vertical bore extending inwardly from the lower end of the body, a plug threaded in said bore and having a loose threaded fit in the body for withdrawing condensate from within the enclosure, 2. tube mounted vertically in the body with the lower end of the tube arranged in juxtaposition to the upper end of the plug, the upper .end portion of the body being formed with a recess encircling the upper end portion of the tube and forming a sediment collecting sump, a canopy secured to the upper end of said tube and overlying said recess in spaced relation to the upper end thereof, and said tube having a drain inlet intermediate its ends.

3. An explosion proof drain for electrical apparatus enclosures comprising a body adapted to be threaded into the bottom Wall of the enclosure and being formed with a vertically extending axial bore, a plug member threaded in said bore, said plug being a loose threaded fit in the body to permit moisture to drain downwardly between the plug and the body, said plug and body being formed With stop means cooperable to prevent a complete rotation of the plug in the body, a tube mounted in the upper end of the body coaxial with said plug with the lower end of the tube terminating in juxtaposition to the upper end of the plug, the upper end of said body being formed with a cylindrical recess encircling said tube and forming a sediment collecting sump, and said tube having a drain opening adjacent the upper end thereof.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,084,191 Beadman et a1 Jan. 18, 1914 1,113,683 Pfahler Oct. 13, 1914 1,156,785 Klemt Oct. 12, 1915. 1,459,925 01in June 26, 1923 1,661,453 Wilkes Mar. 6, 1928 1,748,982 Hennessy Mar. 4, 1930 1,812,916 Zerk' July '7, 1931 2,205,336 Beach June 18, 1940 2,516,096 'I'ornblom July 18, 1950 

